blount



(Model.)

- W. o. & E. I. BLGUNT.

LOCK.

No. 273,939. `Pentemted Maryl, 1883.

WT EESEE l Pluijm/ j UNITED STATES PATENT Erice.

WILLIAM o. BLOEM?, or BOSTON, AND. EUGENE I. BLOUNT, or y y oAMBmDe-Eroar, MASSACHUSETTS.

LOCK.`

SPECIFICATION forming part of Letters Patent No. 273,939, dated March 13, 1883.

' Applieatonled August 15,1882. (Model.) A

To all 'whom it may concern Beit known that we,W1LLIAM G. BLoUNr, of Boston, Suolk county, State of Massachu- .setts, and EUG-ENE I. BLoUN'r, of Cambridgeport, Middlesex county, State of Massachusetts,have invented an Improvement in Locks, of which the following description, in connection with the accompanying drawings, is ,a specification.

Our invention relating to locks is embodied in a lock having a series of' rotating or cylindrical tumblers, which have to be brought into a certain exact definite position with relation to one another beforethe bolt-actuating device can` be moved to throw the bolt. The said tumblers are each provided withpa receivingnotch in their periphery, and the said notches, when in line with one another, receive a projection on the bolt-throwing device, which lies over the peripheries of all the said tumblers and is sustained by any one vof them until the vided with a single longitudinal groove to receive the said projections when the key is inserted or removed, the said projections then being in line with one another. r),he tumblers are provided with a friction device, preventing their rotation until the dogs are positively engaged, the longitudinal groove in the key being inclined on one side, so that when rotated in one direction it lnerely throws the dogs back, and the tumblers do not turn until the dogs are again engaged by the shoulders, which are so arranged in relation to the receiving-notches of the tumblers that in the continued. rotation of the key the said dogs are engaged, and the tumblers are tlrstbrought with= their receiving-notches in line, and then beneath the projection of the bolt-actuating device, enabling the bolt to be operated. The bolt-actuating device is provided with Vdisen- Ga ing-cams, which by the continued movee g ment of the key and tumblers remove its projection from the receiving-notches, and a locking-projection prevents the movement oi' the said bolt-actuating device, except when its projection lies in the receiving-notches of the tumblers. v

Figure l is a front elevation of a lock embodying this invention; Fig. .2, an under side view thereof; Fig. 3, a similar elevation with the front plates removed, the key being shown in section and the ,bolt in dotted lines; Figj4, a section on line a: a', Fig. l; Fig.l 5, a detail showing the bolt-actuating device, its actuating-tumbler, and locking-projection; Fig. 6, a detail showing one ot the controlling-tumblers detached; Fig. 7, a detail showing the actuatj ing-tumbler detached; Fig. 8, a detail ot' the bolt-actuating device, and Fig. 9 a side elevation ot' the key shown partly in section.

The bolt a, ofany suitable kind, herein shown as adapted to lock the cover of a box, chest, or trunk, is provided .with a notch, 2, to receive the actuating bit or projection b' of the bolt-actuating device b, so that when the latter is oscillated on the key-tube c ot' the lockplate as a center it will throw the said bolt a. The Said bolt-actuating device b is. thus oscillated by means of the tumbler-projection b2, entering a square-sided notch, 3, in the actuating-tumbler d, preferably made ot steel, and provided with a tongue, d', entering a notch or. groove, 4, in the shank of the key e, so that the said tumbler is positively rotated with the key e in either direction. The bolt-actuating device b is slotted, or has its bearing on the key-tube c elongated, as shown at 5, thus permitting a movement ofthe said device b, by

which the tumbler-projection bzis moved radially toward and from the axis of rot-ation ot" the key and tnmblers, this movement taking place when it is thrown out of or enters the notch 3. The device b is provided with sprin gs f, tending to throw it into position with the projection b2, entering the notch 3, when the said notch is brought beneath it in the rotation of the tumbler d. The said projection b2 is, however, prevented from thus falling into the notch 3 ofthe actuating-tumbler d, except when the proper key is used, by the controlling-tnmblers g, any number of which may be IClOv employed, they, together with the actuatingtumbler, being contained and rotatingn a cylindrical tumbler-barrel, h', on the lock-plate.

The said controllin g-tu m blers are also provided with receiving-notches 3 for the projection b2, and it is only when the notches 3 are all brought simultaneously beneath the projection b2 that the latter will drop into and be actuated by the tumbler d and key. The controlling-tumblers are rotated to bring their notches 3 into line with that of the actuating-tumbler by means ot' dogs h, acted upon by springs 't' to throw their projecting ends into the central key-socket. When the key is inserted or withdrawn the projecting ends of the dogs h and the projection d are in line with one another, the notches 3 then not being in line, and the key-shank is provided with a longitudinal groove, 4, (see Fig. 9.) which receives the projecting ends of the dogs It and the projection d. The upper portion of the groove 4, which receives the ends ofthe dogs, has one edge inclined or its bottom extended until it intersects the surface ofthe key, as shown in Figs.

3 and 6, so that when the key is turned in one direction (for convenience call it the forward rotation 7-na mely, that ofthe hands ofa clock) the dogs will be merely thrown back, and the tumblers will not immediately be rotated, they being partially held by a friction device, t. The key is, however, provided with a series of recesses, m-one to each controlling-tumblerone side oi' which forms ashoulder, which in the continued rotation ofthekey will bebrought in line with and engage the corresponding dogs, h, the said shoulders being so located that the dogs will each 'be engaged thereby at the moment in the rotation of' thekey and actuatingtumbler when the notch 3 oi' the said actuatingtum bler is in line with the notch 3 of the controllingtumbler the dog` ot' which is engaged. Thus by the continued forward rotation of the key the notches 3 will all be brought in line with one another, and will ultimately arrive beneath the tumbler-projection b2, lthus permittingthe bolt-operating deviceb to be thrown by the springs f into engagement with the tumblers, as shown in Fig.3, when it .can be oscillated in either direction to throw the bolt by the backward or forward rotation of the key. The said bolt-actuating device b is provided with disengaging-t-.ams b3, one of which,

after the bolt has been thrown in either direction, is brought in contact with the corresponding projection, fn, on the lock-plate, which acts, as the said device b is forcibly pressed against it, to move the said device, with its projection b2, radially outward (see Fig. 5) until the said projection leaves the notches 3 and the tu rnblers in their further movement have the unnotched portion of their periphery brought beneath the said projection b2, thus keeping it in the position shown in Fig. 5, or in the corre-- sponding position on the other side of the locking-projection r on the lock-plate, which prevents the movement ofthe device b until it is moved radially inward into engagement with thc tumbler-notches, it being positively held by the projections ai and the periphery of the tumblers. The edges m of the key-shank are inclined on the side opposite to the shoulders, so that when the key is rotated in the backward direction the dogs It will be thrown back and the tumblers g will not move until engaged by the groove 4, which has its side thus engaged in the backward rotation made as a shoulder, so that i-n the continued backward rotation of the key the dogs h will all have their ends received in the groove 4; in line with the projection d', so that the key may be withdrawn, leaving the said projections lt and din line, ready for the next insertion of the key. It will be seen that it is only when the shoulders of the recesses m are in exactly the proper position relative to one another that the notches 3 will be brought into line and the bolt-actuating device engaged to throw the bolt, and it' a key that is not properly constructed is inserted it will not be possible to injure or strain any of the parts of the lock, as the tumblers will be merely rotated in their socket without producing any further effect. The work of throwing the bolt and disengaging the actuating device b falls wholly upon the actuating tumbler d on account ot' its positive engagement with the key, and the said tumbler is preferably made ot' steel or other material suitable for withstanding the wear. The other tumblers merely control the engagement ot' the projection b2, and when thus engaged are moved by the said projection rather than by the dogs h and shoulders in the key.

We claim- 1. The holt and the boltfactuating device provided with a tumbler-engaging projection, a bolt engaging bit, and disengaging cams, combined with the tumblers, and the disen` gagiiig-projections upon the lock-plate, co-operating with the said disengaging-cams and the locking-projection fr on the Iockplate, whereby the said bolt-actuating device is prevented from moving` except when engaged by all the Vsaid tumblers, substantially as described.

2. The key provided with a longitudinal groove and shouldered recesses, combined with the actuating-tumbler d, provided with a projection for positively engaging the said groove, and the controlling-tumblers g, provided with spring pressed dogs It, adapted to be engaged hy the said shouldered portions of the key, 'substantially as described. t

In testimony whereof we have signed our names to this specification in the presence ot' two subscribing witnesses.

WILLIAM C. BLOUNT. EUGENE I. BLOUNT. Witnesses:

Jos. P. LIVERMoRE, B. J. NoYEs.

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